Aluminum-silicon alloy



Patented Aug. 10, 1926.

UNITED STATES ALADAB PACZ, O1 CLEVELAND, OHIO, ASSIGNOR TO ALUMINUM COMPANY OF AMERI- GA, 013 PITTSBURGH, PENNSYLVANIA, A CORPORATION 01 PENNSYLVANIA.

ALUMINUM-SILICON ALLOY.

Ne Drawing.

My invention relatesto alloys' containing principally aluminum and silicon. In my application, Serial No. 323,350, filed Seplember 12, 1919, is disclosed an alloy of silicon and aluminum containing upwards of 2 1/2% of silicon, and, more specifically, such an alloy containing aluminum, silicon and copper. In my Patent No. 1,387,900, is sued August 16, I921, I have disclosed the 10 use of alkali fluorine compounds to enhance 0 connection with metal 5 fluorine comp the pro rties of alloys of aluminum and silicon. 3 resent invention consists of the addition of manganese in small amounts to aluminum silicon alloys and is efiicaeious even where the alkali fluorine compound is not utilized. This is particularly apparent in the case of die-castings orcastings made in permanent molds. However, my inventi on may also be used to great advantage in treated with alkali fluorine compound or having other constituents.

Although in the case of sand castings, the. best results are secured when the alkali ound is used, sand castings having superior physical properties such as tensile strength, elongation and workability, may be obtained by manganese to the aluminum 'licon alloy without utilizing the grain re ning agent. It seems that when manganese is cmplo ed, the injurious effect of an iron impurlties which may be present in t e. allov'is diminished. It may be that the beneficial eflect of the manganese is due to this neutralization of the injurious efl'ects of the iron and other impurities, but I do not confine myself in any way to such theory. The efi'ect of themanganese on the aluminum silicon alloy is probably to produce a better dissemination of the silicon in the a loy. At any rate, the finer rained structure which is produced throng the use of manganese is evidence of its beneficial function. The advantages arising from the addition of manganesc are apparent even where the manganese comprises only 1/10 of one per cent of the alloy. The amount of manganese may be increased, depending upon the use to which the product is to be put. and also depending upon the percentages of other elements, such as the silicon, and also depending upon the amount of impurities, such as iron.

the addition of the well-known methods. It

Application filed February 27, 1922. Serial No. 539,740.

In one instance where I applied my invention to die casting, I employed 8/10 of one per cent manpanese in an alloy containing 8 per cent si icon and the rest aluminum. In another instance of die casting, I utilized 5/10 of one per cent manganese in an alloy containing 13 per cent silicon and the rest aluminum. In both of these cases the resulting alloy had a very fine grained structure, high ductility and tensile strength. The results showed that the advantages of the invention may be secured even without utilizing the alkali fluorine compound referred 1,387,900. This should be true also of castings made in permanent molds where there is a chilling action similar to that given the metal in die casting.

My invention is applicable not only to aluminum alloys containing the higher perccntages of silicon such as 5 per cent and above, but may be used to advantage in any aluminum silicon alloy containin a substantial amount of silicon. The addition of the manganese inall cases produces superi r physical properties.

he manganese may beincorpo'rated with the aluminum silicon'alloy by any of the may he added by itself or as an alloy with the aluminum. or with aluminum silicon, or with any other constituent which it is desired to incororate in the alloy. One method which I ave practiced successfully is to briquette, for example, grams of manganese powder with 56 ams sodium silico fluoride and 11 grams 0 aluminum powder. This is in accordance with the practice set forth in up lication Serial Nos. 866,967 and 366,968. his may be added to suflicient aluminum silicon alloy to produce an alloy-which will be high in manganese, for instance as high as 33%, and this alloy may be added in the requisite proportions to the actual castin alloy. Another pr'nctice would be to add t 1e briquettes directly to the actual casting alloy.

The alloys roduced according to my invention may e utilized for an kind of casting, and such castings may a worked as by rolling, extruding, forging drawing, etc.

What I claim and desire to secure by Letters Patent is:

1. An alloy consisting predominantly of to in my Patent- No.

aluminum and containin a small percentage of manganese-ans between about 2 112% and about 15% of silicon.

2. An alloy consisking predominantly of aluminum and containing manganese and between about 2 1/295 and about 15% of silicon, the manganese constituting a. small percentage of but not less than about 0.1% of the alloy.

3. .-\n aluminum base Alloy containing from about 3 to 15 per cent of silicon and from 0.1 to 0.8 per cent of manganese.

4. An aluminum base alloy containing from 8% to 13% of silicon and a small percentage of but not less than about 0.1% of manganese.

5. A chill casting formed of an aluminum base alloy containing from about 3 to 15 per cent of silicon and from about 0.1 to 0.8 per cent of manganese.

6. An article formed from an aluminum base alloy containing from about in about 15% of silicon and from about 0.1% to about 0.8% of manganese and having n fined grain and improved physical plflil'l ties characteristic of the treatment with an alkali fluorine compound of an aluminur. alloy containing from about 3 to 15% of silicon.

In witness whereof, I have hereunto sol aluminum and containin a small percentage of manganese an between about 2 1/ ",2 and about 1.5% of silicon.

2. An alloy consisting predominantly of aluminum and containing manganese and between about 2 1/270 and about 151; of silicon. the manganese constituting a small peri-mitage of but not less than about 0.1% of the alloy.

3. An aluminum base alloy containin from about 3 to 15 per cent of silicon and from 0.1 to 0.8 per cent of manganese.

4. An aluminum base allov containing: from 8% to 1372-. of silicon and a small pen centage of but not less than about 0.1% of manganese.

5. A chill casting formed of an aluminun base alloy containing from about 3 to 15 per cent of silicon and from about 0.1 to 0.8 per cent of manganese.

6. An article formed from an aluminum base alloy containing from about 3)? to about 157, of silicon and from about 0.1"; to about 0.8"} of manganese and having re fined grain and improved physical propel ties characteristic of the treatment with an alkali fluorine compound of an aluminum alloy containing from about 3 to 15)? oi silicon.

In witness whereof, I have hereunto set my hand this 24th day of February. 19-22.

ALADAR PACZ.

DISCLAIMER 1,595,218.Aladar Pacz, Cleveland, Ohio.

dated August 10, 1926.

Hereb ALUMINUM-SILICON ALLOY. Patent Disclaimer filed November 9, 1937 b th Aluminum Company of America. y e asslgnee disclaims the claims numbered 1 and 2 of said Letters Patent.

[ c'ial Gazette November 30, 1937 .1

DISOLA! MEFZ 1,595,218.Aladar Pacz, Clm'eiand, Ohio. ALIYMINUM-SILICON ALLOY. Patent dated August 10 1926. Disclaimm" filed November 9, 1937, by the assignce, Aluminum Company of America. Hereb disclaims the claims numbered 1 and 2 of said Letters Patent.

[ cial Gazette Noaember 30, 1.937.] 

